<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<picture>
  <source media="(min-width: 650px)" srcset="null.bmp">
  <source media="(min-width: 465px)" srcset="null.bmp">
  <img src="null.bmp">
</picture>

<audio controls>
  <source src="null.ogg" type="audio/ogg">
  <source src="null.mp3" type="audio/mpeg">
</audio>

<video controls>
  <source src="null.webm" type="video/webm">
  <source src="null.mp4" type="video/mp4">
</video>
</body>
</html>
